Dr. Goddard was the first to: • mathematically prove that a rocket can propel in a vacuum (in 1907); • patent the oscillator tube, which was later used in the radio industry (1912); • patent the concept of the multi-stage rocket (in 1914); • prove by testing that rockets can propel in a vacuum (in 1915); • invent the prototype of the bazooka (in 1918); • develop a rocket using liquid fuels (in 1921-1926); • have a liquid-fueled rocket lift its own weight (at Clark University on Dec. 6, 1925); • successfully fire a liquid fuel rocket (in Auburn, MA on March 16, 1926); • launch a rocket with a scientific payload (a barometer and a camera in 1929); • develop gyro stabilization apparatus as an internal guidance system for rockets (in 1932); • use vanes in rocket motor blast for guidance (in 1932); • fire a liquid fuel rocket that traveled faster than the speed of sound (on March 8, 1935); • use a rocket engine pivoted on gimbals controlled by a gyro mechanism (1937). Dr. Goddard also: • was first to use a De Laval (expanding cone) Nozzle in a rocket; • developed the first turbo pumps for a liquid propellant rocket; • used the first pulse-jet engine; • developed the first liquid propellant rocket cluster.